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b= (h+4cm)
h= ?
P=2b+2h......... o .........P=b+b+h+h
P=b+b+h+h
40cm=(h+4cm)+(h+4cm)+h+h
40cm= 4h+8cm
40cm-8cm=4h
32cm=4h
h=32cm/4
h= 8cm
dale gracias y 5 estrellas :v